Pressure head for piston-ring grinders



Nov, 19, 1929. c. E. JOHNSON PRESSURE HEAD FOR PISTON RING GRINDERS 2 .Shets-Sheet Filed May 31. 1927 lnue nTor Charles E. Johnson Mom Nov. 19, 1929. c. E. JOHNSON 1 1,735,199

PREISSURE HEAD FOR PISTON RING GRINDERS Filed May 31, 1927 Z-Sheets-Sheet 2 a5 V I5 I l4 o l4 IIIH HI IIIHIIIH lnvenfor Patented Nov. 19, 19 29 UNITE S CHARLES E. JOHNsON, or MUSKEGON, MICHIGAN, 'AssIGNon 'ro 'rHE rIsroNI ING COMPANY, or MUSKEGON HEIGHTS, MICHIGAN, A CORPORATIO OI MICHIGAN rnnssunn HEAD non PIs'roN-RING GnINDERs I Application filed. May 31,

issued August'25, 1925. The pressure head embodying this invention is intended to be used with the same type of piston ring grinding machine shown in said patent and for the same purpose as the pressure head shown 10 in said patent, namely, the pressing of a piston ring against a grinding wheel as the ring is moved across the face thereof.

In the manufacture Ofpiston rings it is very desirable to submit them to a flattening process for the purpose of making one face of the ring absolutely flat ortrue. This fiattening process must be performed upon one surface of the ring while the ring is in its 1 natural undistorted condition and is preferably performed by passing the ring over ing the process.

A difiiculty experlencedbyluse of the pressure head of the above mentioned patent this flattening process is performed it isnot v p sure head embodymg thlsinvention is used and against the surface of a grinding wheel and pressing or holding the ring against the grinding wheel with sufficient pressure to enable the grinding wheelto grind the sur-' 25 face of the ring. The pressure must be uniformly applied to all parts of the ring and must not be sufiicient to distort the ring durthe ring was located exactly centrally of the 1 pressure head and in the machine by which expedient toprovidefor the exact centrah izing of the ring relative to the pressure head. Another'difficulty arising in the use of priordevices has been atendency to discases as narrow as th of. an inch, devices which would practically operate with the former wider and, consequently more rigid rings are not satisfactory: with the present narrower and more flexible rings. In addition to this engineering specifications call for eratively engaging a piston ring.

. against it, and

5 is'a pressure head.

1927. Serial No. 195,207.

a much more heretofore. p A

The pressure head embodying the present invention is intended to overcome allof the defects and ineff ciencies of former devices of'this character. andis adapted to engage a piston ring locatedbeneath it whether centrally of itor not and to press all portions of it with equal pressure'against the surface of a grlndmg wheel as the ring is moved over -l13." The inventlon is provided with various perfect fit of the ring now than V novel features of construction and arrangement hereinafter more] fully described and particularly pointed out in the claims, refererence being had to the accompanyingdrawin s, in which:

ig. 1 is a plan View of a grinding wheel and a portion of the machine used topass the ring over thesurface thereof showing several of the pressure headsembodying this invention operatively applied thereto.

Fig. 2 is an enlarged fragmentary-sectional elevation of the same on the line, 22 of Fi.-1. 1 A 1 1% ig. 3 is an enlarged, approximately. full size, vertical section of the pressure head op- Fig. 4 in an inverted plan view ofthe pressure I head with a piston ring located Like reference characters I refer tolike parts in the different figures-of the drawings.

The grindingmachine with which the-pres comprises a horizontally disposed grinding a v a; 80.7 fragmentary plan'viewof the wheel'l and a rotating disk 2 which overlaps i a part of the horizontal grinding surface of the grinding wheel. The;disk has a plurality .of Circular openings 3 spaced aboutit near its periphery, each opening beinglarge enough to loosely receive a piston ring. The disk near its peripheryis thinner than the ring to be ground. A feeding device 4: is provided which deposits the ringsone at, a time,

in the respective openings asthe disk} rotates and these rings'arecarried by'rotation v of'the disk across and in engagement'with the horizontal surface of the grinding wheel.

arms end'the ressure heads thereon he raised or lowered for the purpose hereafter described.

The pressure head comprises a substantially circular disk shaped body which has a big 11 eentrally located on its upper side to which the outer end of the arm 6 is pivotall'y attached;- A plurality of wei'ghts -12are i annularly arranged and located under the body-10 these weights each being of the shine weight and the weights are preferably elongated rectangular in'shape having flat lower surfaces and extending radiall from the axis of the-head: Each weight is independently mounted on the body '10 of the head hy-two vertical stems 13which extend through corresponding openings '14 in the body and are provided with retaining means such as cotter pins 15 above the body. The stems are suf- -fieient1y l'ongfs'o that a limited vertical movement is allowed for each weigh t'relative to the body and the holes 14 are enough langer than the stems 1.8 so that an abs'o'lutelyfree movement without binding or cramping is obtained. The'lowersurfaces of' th'e weights which are ann'ularly arranged include 'or cover annular area considerablylarger than the ring which is to be erformedupon.

In use the pressure heads are located 'substen'tiallyeentra liy over the openings 3 in the disk 2' but a -variety'bfsizes of ring are ground with the machine using the same diemete openings 3 and ref "this reason, es-

Q eeeien ehena ring considerably smaller than the opening 3 is used the Ting will not "be located ekac'tly centrally tinder thefpressure head. The rings 16 are deposited-in ,fthe' openin 'ss by thefeed'in'gdevice 4 and its the disk rotates the respective pressure heads are lowered upon the rings at approxi- 'm'ately the 'sanretiine 'tliat th'e ringsare carcried upon the-grinding whee-1, this lowering Q of the pressure head being accomplishedby movement of the arm 6, the innerend of which is; acted-u on by'the stationary' 'c'am 9. The cam 19 is so shapedthat, when. the

head Qi-s lowered the weights 12 will be brought into "engagement with the uppersurface of the ring 1 6'and the body 10 will he lowered suflic'ie'l' tly torelease all of the weights but will he held high enough soithat it, will not'fengage the weights, this position jbeing illustrated in Fig. Thehea'd is held in this position "during the movement er the ring-sen e the grinding wheel. Just before et'e'r will opariate upon rings of various the ring leaves the grinding wheel it is desirable to raise the head completely from the ring which is done by action of the cam 9 against the inner end of arm 6 and as the body 10 rises the retainers 15 will engage its upper surface. and lift the weights from the ring. The heads are held in this raised position until they pass the feeding device and are again lowered in engagement witha ringto be 'passed over'th'e grindingfwheel.

By ineene'or this device it will seen that the ring is pressed against the grinding wheel by engagement with its upper surface of the plurality of weights only, the weight of the body 10 not being exerted upon the ring. Inasmuch as each or" the weighte la is independently-movable it Will'bea-r against that po'r't-i'on only "of the ring directly beneath it and therefore an uneven surface of the ring. will have no, effect upon the pressure at its various points. Each we i ght will exert its "own independent pressure uponthe ring at its respective point and I as the weights are uniform the pressure at all points of the ring will be uniform. 'lf the ring is-not located exactly centrally of the pressune headiit will not result inun'eve n pressure in a greater pressure 'en'ene side than on the othersince the pressure is- -not applied centrally of the pressure head as informer structures but "each weight e'e'ts independently and exerts its 'own pressnre. I

Pressure heads of different proportions are provided for different sizes and widths of rings, a narrowe'aslly flexed rln-g bemgused.

with a,pressure headhaving relatively light weights while a wider stifier ringnwillnuse a pressure head having heavier weights. Extreme changes inidiameters of the rings will re uire a pressure head of different, di-

ame'ter uta pressure head'of thesamediameters within certain limits. x.

Although thisinvention has eta-decreed in its adaptation foru'grindingi piston rings: it is conceived that the same principle may diambe utilized for other purposes and, it,is tobe -=L'1nderst0od th'at the scope oftheclai-ms isnot I to be limited strictly vention in rpistonringqgrinding. I ;1. A, grinding machlnefor .p1ston rings,

comprising a :grinding wheel, a disk heving n portioniwith openingsto receive piston ri" gs mounted te retate w'i't saidpo 'tion-over the 1'- grinding wheelg a ressurehemiee ieeever each of said"open'ihgs," each pressure. head ,to the-.use of the incoin risin bodv and a luralitv of wei hts t) u 1. b

connected to the body, each weight having a limited independent movement relative to the body andmeans for lowering the ressure head to engage the weights with the "ring in the "openin and to 'su'spe'nd the body withits weight free from saidweig-hts, I

2. 'A-igrind-ing machine for piston rings plurality of weights, each weight independ-.

ently connected to the body for limited movement relative thereto and means actuating upon'said arm for lowering the pressure head to engage the weights with a piston ring in said opening and to suspend said body with its weight free from said weights.

3. In a device of the class described, means for guiding an'article to be worked upon, a pressure head located above said guiding means and an article therein, said pressure head comprising a bodyand aplurality of weights connected to said body and adapted to engage said article at different points, each weight beingmounted for independent movement relative to the body and to each other and means for holding the body with the weights in engagement with said article and with its weight free from said weights.

4. In a device of the class described, a guide for an article to be worked upon, a

pressure head located above said guideand. an artlcle therein, said pressure head comprising a body and a plurality of annularlv arranged weights adapted to engage said body at different points, said weights being mounted on said body for independent vertical movement relative to the body and to each other and means for lowering the pres- V surehead to engage the weights with the article and for holding the body with its weight free fromtheweights.

5. In a device of the class described, a'

guide for an article to be worked upon,'a pressure head located above said guide and above an article therein comprising a body, a plurality of elongated weights annularly arranged beneath said body, each weight extending radially from the axis of the annulus, two stems extending upwardly from each other and passing freely through the body and means at the upper ends of the stems for retaining the stems in the body and for permitting a limited movement .of the stems in the body.

the weights in engagement with said article and with its weight free from said weights.

7 In a device of the class described, means for supporting an article to be worked upon, a pressure head associated with said supporting means and an article thereon, said pres sure head comprising a body and a plurality of annularly arranged weights adapted to engage said body at different points, said weights being mounted on said body for independent vertical movement relative to the body and to each other and means for lower- 7 ing the pressure head to engage the weights with the article and for holding the body with its weight free from the weights. 2 y

8. In a device of the class described, means for supporting an article to be worked upon, a pressure head associated with said supporting means and an article thereon, said pressure head comprising a body, a plurality of elongated weights annularly arranged beneath said body, each weight extending radially from the axis of the annulus, two stems extending upwardly from each other and passing freely through thebody and means at the upper ends of the stems for retaining the stems in the body and for permitting a limited movement of the stems in the body. ii

In testimony whereof I aflix my signature;

CHARLES E. JOHNSON.

. In a device'of the class described, means for supporting. an article to be worked upon, a pressure head associated with sa d supporting means and an article thereon, said pressure head comprising a body and a plurality I of weights connected to said body and adapted to engage said article at different points,

7 each weight being m'ountedfor independent] 7 movement relative to the body and to each other and means for holding the body with 

